If TSHTF or PSHTF = WROL, then the scenario will be different & a hands on approach will not be the best choice. Proficiency with shotties prior to any SHTF event is a good move.
Most people use shotguns for sport in a civilian setting for clay pigeon shooting. You can find clubs doing this easily online. There are some clubs that do Practical Shotgun.
. This is basically the PC wording of Combat Shotgun. It is a recognised modern sport Worldwide and instead of shooting at man shaped targets nowadays, you shoot at small metal plates. The courses of fire vary considerably and can involve proceeding through corridors/rooms and having moving or disappearing targets etc. There are many variations of stage set ups. Last weekend I had great fun taking part in a comp at my club. It was 9 stages long which also included us shooting slug at 50 yards and again at 15 at a fast moving bobbing target. It was surprising how many, including v.experienced shooters missed the 50yard slug targets. This is all regulated officially recognised institutions like the UKPSA.
http://www.ukpsa.co.uk
Section 1 Shotguns are generally as cheap as or cheaper second hand than section 2 shotguns due to the limited number of licence holders. A good quality pump gun can be had for as little as £200 from a dealer. On a normal day practising, we get through about 100 shells on average and that is taking our time and having a natter etc. There is 25 to a box and a box is about £4 to £5. Club membership is around £100 per year with all its facilities. You can spend a lot or little as you wish depending on what you buy and wether new or not. The shells at £18 for the day practising is fairly cheap for a hobby nowadays + membership divided by the number of attendances. A decent gun cabinet will be required - from £40 to £100 second hand.
There is a very good club down south called "Shield Shooting Centre". Some of the guys came up at the weekend and they were darn good shots. They are on the gun club forum too.
If you wish to know any more, then just PM me. Regards, TL
http://www.ipsc.org/ipsc/tellmemore.php